Paul Potts

James Corden

Braddon

Mackenzie Crook

Julie-Ann Cooper

Alexandra Roach

Yvonne Potts

Julie Walters

Roland Potts

Colm Meaney

Hydrangea

Jemima Rooper

Alessandra

Valeria Bilello

Matthew

Trystan Gravelle

Choirmaster

Sion Tudor Owen

Dr. Thorpe

Alex Macqueen

Signora Fiorentino

Miriam Lucia

Luciano Pavarotti

Stanley Townsend

Nurse

Di Botcher

Talent Show Punter (uncredited)

Jon Wennington